Optical imaging lens

ABSTRACT

An optical imaging lens includes a first lens element to a ninth lens element from an object side to an image side along an optical axis and each lens element has an object-side surface and an image-side surface. A periphery region of the object-side surface of the fourth lens element is concave, an optical axis region of the image-side surface of the fourth lens element is convex, an optical axis region of the object-side surface of the seventh lens element is concave, an optical axis region of the image-side surface of the eighth lens element is concave, and an optical axis region of the object-side surface of the ninth lens element is concave. Lens elements included by the optical imaging lens are only nine lens elements described above. An Abbe number of the fifth lens element ν5 and an Abbe number of the ninth lens element ν9 satisfy ν5+ν9≤100.000.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention generally relates to an optical imaging lens.Specifically speaking, the present invention is directed to an opticalimaging lens for using in electronic devices, such as for application inportable electronic devices, for example a mobile phone, a head-mounteddisplay device (AR, VR, MR), a tablet personal computer, or a personaldigital assistant (PDA) and for taking pictures or for recording videos.

2. Description of the Prior Art

The specifications of portable electronic devices are changing, andtheir key components-optical imaging lenses are also developing morediversely. As far as a main lens of a portable electronic device isconcerned, it does not only pursues a smaller f-number (Fno) andmaintain a shorter system length, but also pursues more pixels andbetter resolution. More pixels imply the increase of the image height ofthe lens to receive more imaging rays to meet the pixel demands by usinga larger imaging sensor.

However, the design of a larger aperture stop makes the lens receivemore imaging rays but more difficult to design. More pixels make theresolution of the lens higher to go with the design of a larger aperturestop to make it much more difficult to design. Therefore, it is aproblem to add more lens elements in the limited system length and toincrease the resolution while to have a larger aperture stop and alarger image height to be solved.

SUMMARY OF THE INVENTION

In the light of above, various embodiments of the present inventionpropose an optical imaging lens of nine lens elements which has a largeraperture stop, a larger image height, enhanced resolution, maintainsgood imaging quality, and is technically possible. The optical imaginglens of nine lens elements of the present invention from an object sideto an image side in order along an optical axis has a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement, an eighth lens element and a ninth lens element. Each one ofthe first lens element, the second lens element, the third lens element,the fourth lens element, the fifth lens element, the sixth lens element,the seventh lens element, the eighth lens element and the ninth lenselement respectively has an object-side surface which faces toward theobject side to allow imaging rays to pass through as well as animage-side surface which faces toward the image side to allow theimaging rays to pass through.

In one embodiment, a periphery region of the object-side surface of thefourth lens element is concave and an optical axis region of theimage-side surface of the fourth lens element is convex, an optical axisregion of the object-side surface of the seventh lens element isconcave, an optical axis region of the image-side surface of the eighthlens element is concave, and an optical axis region of the object-sidesurface of the ninth lens element is concave. Lens elements included bythe optical imaging lens are only the nine lens elements described aboveto satisfy ν5+ν9≤100.000.

In another embodiment of the present invention, the first lens elementhas positive refracting power, the second lens element has negativerefracting power, a periphery region of the object-side surface of thethird lens element is convex, a periphery region of the object-sidesurface of the fourth lens element is concave, an optical axis region ofthe object-side surface of the seventh lens element is concave, and anoptical axis region of the image-side surface of the ninth lens elementis concave. Lens elements included by the optical imaging lens are onlythe nine lens elements described above to satisfy ν8+ν9≤100.000.

In still another embodiment of the present invention, a periphery regionof the image-side surface of the third lens element is concave, aperiphery region of the object-side surface of the fifth lens element isconcave, an optical axis region of the object-side surface of the sixthlens element is convex, an optical axis region of the object-sidesurface of the seventh lens element is concave, and an optical axisregion of the image-side surface of the ninth lens element is concaveand a periphery region of the image-side surface of the ninth lenselement is convex. Lens elements included by the optical imaging lensare only the nine lens elements described above to satisfyν8+ν9≤100.000.

In the optical imaging lens of the present invention, the embodimentsmay also selectively satisfy the following optical relationships:

ν5+ν6≤100.000;

ν3+ν9≤100.000;

ν7+ν8+ν9≤135.000;

Fno*AA15/T2≤6.000;

4.000≤(EPD+TTL)/D12t62;

3.200≤(T1+D62t92)/(AA15+T6);

(AAG+BFL)/D62t82≤3.900;

26.000 degrees≤HFOV/Fno;

(D12t32+D51t62)/D32t51≤2.100;

D41t62/(T3+G34)≤3.400;

Fno*D11t32/T7≤4.300;

D11t32/G67≤3.400;

5.000≤(ALT+EPD)/D11t32;

Fno*D11t62/(T7+T8+T9)≤3.600;

D41t62/G67≤3.600;

(D12t32+D51t62)/T8≤3.500;

(AA15+T6)/G67≤2.500;

13.000 degrees/mm≤HFOV/D12t62;

5.700≤(EPD+TL)/(D12t32+D51t62);

2.700≤(ImgH+EPD)/(D12t32+D41t62);

2.700≤(EFL+EPD)/(D12t32+D41t62).

In the present invention, T1 is a thickness of the first lens elementalong the optical axis, T2 is a thickness of the second lens elementalong the optical axis, T3 is a thickness of the third lens elementalong the optical axis, T6 is a thickness of the sixth lens elementalong the optical axis, T7 is a thickness of the seventh lens elementalong the optical axis, T8 is a thickness of the eighth lens elementalong the optical axis, and T9 is a thickness of the ninth lens elementalong the optical axis.

Further, G34 is an air gap between the third lens element and the fourthlens element along the optical axis, G67 is an air gap between the sixthlens element and the seventh lens element along the optical axis. ν3 isan Abbe number of the third lens element, ν5 is an Abbe number of thefifth lens element, ν6 is an Abbe number of the sixth lens element, ν7is an Abbe number of the seventh lens element, ν8 is an Abbe number ofthe eighth lens element, ν9 is an Abbe number of the ninth lens element.

AA15 is a sum of five air gaps from the first lens element to the sixthlens element along the optical axis, D12t62 is defined as a distancefrom the image-side surface of the first lens element to the image-sidesurface of the sixth lens element along the optical axis, D62t92 isdefined as a distance from the image-side surface of the sixth lenselement to the image-side surface of the ninth lens element along theoptical axis, D62t82 is defined as a distance from the image-sidesurface of the sixth lens element to the image-side surface of theeighth lens element along the optical axis, D12t32 is defined as adistance from the image-side surface of the first lens element to theimage-side surface of the third lens element along the optical axis,D51t62 is defined as a distance from the object-side surface of thefifth lens element to the image-side surface of the sixth lens elementalong the optical axis, D32t51 is defined as a distance from theimage-side surface of the third lens element to the object-side surfaceof the fifth lens element along the optical axis, D41t62 is defined as adistance from the object-side surface of the fourth lens element to theimage-side surface of the sixth lens element along the optical axis,D11t32 is defined as a distance from the object-side surface of thefirst lens element to the image-side surface of the third lens elementalong the optical axis.

TTL is a distance from the object-side surface of the first lens elementto an image plane along the optical axis, ALT is a sum of ninethicknesses of the nine lens elements from the first lens element to theninth lens element along the optical axis, TL is a distance from theobject-side surface of the first lens element to the image-side surfaceof the ninth lens element along the optical axis, AAG is a sum of eightair gaps from the first lens element to the ninth lens element along theoptical axis, EPD is an entrance pupil diameter of the optical imaginglens, Fno is an f-number of the optical imaging lens, HFOV stands forthe half field of view of the optical imaging lens, ImgH is an imageheight of the optical imaging lens, BFL is a distance from theimage-side surface of the ninth lens element to the image plane alongthe optical axis, and EFL is an effective focal length of the opticalimaging lens.

These and other objectives of the present invention will no doubt becomeobvious to those of ordinary skill in art after reading the followingdetailed description of the preferred embodiment that is illustrated inthe various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1-5 illustrate the methods for determining the surface shapes andfor determining optical axis region or periphery region of one lenselement.

FIG. 6 illustrates a first embodiment of the optical imaging lens of thepresent invention.

FIG. 7A illustrates the longitudinal spherical aberration on the imageplane of the first embodiment.

FIG. 7B illustrates the field curvature aberration on the sagittaldirection of the first embodiment.

FIG. 7C illustrates the field curvature aberration on the tangentialdirection of the first embodiment.

FIG. 7D illustrates the distortion of the first embodiment.

FIG. 8 illustrates a second embodiment of the optical imaging lens ofthe present invention.

FIG. 9A illustrates the longitudinal spherical aberration on the imageplane of the second embodiment.

FIG. 9B illustrates the field curvature aberration on the sagittaldirection of the second embodiment.

FIG. 9C illustrates the field curvature aberration on the tangentialdirection of the second embodiment.

FIG. 9D illustrates the distortion of the second embodiment.

FIG. 10 illustrates a third embodiment of the optical imaging lens ofthe present invention.

FIG. 11A illustrates the longitudinal spherical aberration on the imageplane of the third embodiment.

FIG. 11B illustrates the field curvature aberration on the sagittaldirection of the third embodiment.

FIG. 11C illustrates the field curvature aberration on the tangentialdirection of the third embodiment.

FIG. 11D illustrates the distortion of the third embodiment.

FIG. 12 illustrates a fourth embodiment of the optical imaging lens ofthe present invention.

FIG. 13A illustrates the longitudinal spherical aberration on the imageplane of the fourth embodiment.

FIG. 13B illustrates the field curvature aberration on the sagittaldirection of the fourth embodiment.

FIG. 13C illustrates the field curvature aberration on the tangentialdirection of the fourth embodiment.

FIG. 13D illustrates the distortion of the fourth embodiment.

FIG. 14 illustrates a fifth embodiment of the optical imaging lens ofthe present invention.

FIG. 15A illustrates the longitudinal spherical aberration on the imageplane of the fifth embodiment.

FIG. 15B illustrates the field curvature aberration on the sagittaldirection of the fifth embodiment.

FIG. 15C illustrates the field curvature aberration on the tangentialdirection of the fifth embodiment.

FIG. 15D illustrates the distortion of the fifth embodiment.

FIG. 16 illustrates a sixth embodiment of the optical imaging lens ofthe present invention.

FIG. 17A illustrates the longitudinal spherical aberration on the imageplane of the sixth embodiment.

FIG. 17B illustrates the field curvature aberration on the sagittaldirection of the sixth embodiment.

FIG. 17C illustrates the field curvature aberration on the tangentialdirection of the sixth embodiment.

FIG. 17D illustrates the distortion of the sixth embodiment.

FIG. 18 illustrates a seventh embodiment of the optical imaging lens ofthe present invention.

FIG. 19A illustrates the longitudinal spherical aberration on the imageplane of the seventh embodiment.

FIG. 19B illustrates the field curvature aberration on the sagittaldirection of the seventh embodiment.

FIG. 19C illustrates the field curvature aberration on the tangentialdirection of the seventh embodiment.

FIG. 19D illustrates the distortion of the seventh embodiment.

FIG. 20 illustrates an eighth embodiment of the optical imaging lens ofthe present invention.

FIG. 21A illustrates the longitudinal spherical aberration on the imageplane of the eighth embodiment.

FIG. 21B illustrates the field curvature aberration on the sagittaldirection of the eighth embodiment.

FIG. 21C illustrates the field curvature aberration on the tangentialdirection of the eighth embodiment.

FIG. 21D illustrates the distortion of the eighth embodiment.

FIG. 22 illustrates a ninth embodiment of the optical imaging lens ofthe present invention.

FIG. 23A illustrates the longitudinal spherical aberration on the imageplane of the ninth embodiment.

FIG. 23B illustrates the field curvature aberration on the sagittaldirection of the ninth embodiment.

FIG. 23C illustrates the field curvature aberration on the tangentialdirection of the ninth embodiment.

FIG. 23D illustrates the distortion of the ninth embodiment.

FIG. 24 shows the optical data of the first embodiment of the opticalimaging lens.

FIG. 25 shows aspheric surface data of the first embodiment.

FIG. 26 shows the optical data of the second embodiment of the opticalimaging lens.

FIG. 27 shows aspheric surface data of the second embodiment.

FIG. 28 shows the optical data of the third embodiment of the opticalimaging lens.

FIG. 29 shows aspheric surface data of the third embodiment.

FIG. 30 shows the optical data of the fourth embodiment of the opticalimaging lens.

FIG. 31 shows aspheric surface data of the fourth embodiment.

FIG. 32 shows the optical data of the fifth embodiment of the opticalimaging lens.

FIG. 33 shows aspheric surface data of the fifth embodiment.

FIG. 34 shows the optical data of the sixth embodiment of the opticalimaging lens.

FIG. 35 shows aspheric surface data of the sixth embodiment.

FIG. 36 shows the optical data of the seventh embodiment of the opticalimaging lens.

FIG. 37 shows aspheric surface data of the seventh embodiment.

FIG. 38 shows the optical data of the eighth embodiment of the opticalimaging lens.

FIG. 39 shows aspheric surface data of the eighth embodiment.

FIG. 40 shows the optical data of the ninth embodiment of the opticalimaging lens.

FIG. 41 shows aspheric surface data of the ninth embodiment.

FIG. 42 shows some important parameters in each embodiment.

FIG. 43 shows some important ratios in each embodiment.

DETAILED DESCRIPTION

The terms “optical axis region”, “periphery region”, “concave”, and“convex” used in this specification and claims should be interpretedbased on the definition listed in the specification by the principle oflexicographer.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1 ). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1 , a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. A surface of the lens element 100 may have no transition pointor have at least one transition point. If multiple transition points arepresent on a single surface, then these transition points aresequentially named along the radial direction of the surface withreference numerals starting from the first transition point. Forexample, the first transition point, e.g., TP1, (closest to the opticalaxis I), the second transition point, e.g., TP2, (as shown in FIG. 4 ),and the Nth transition point (farthest from the optical axis I).

When a surface of the lens element has at least one transition point,the region of the surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest transition point (the Nth transition point) from theoptical axis I to the optical boundary OB of the surface of the lenselement is defined as the periphery region. In some embodiments, theremay be intermediate regions present between the optical axis region andthe periphery region, with the number of intermediate regions dependingon the number of the transition points. When a surface of the lenselement has no transition point, the optical axis region is defined as aregion of 0%-50% of the distance between the optical axis I and theoptical boundary OB of the surface of the lens element, and theperiphery region is defined as a region of 50%-100% of the distancebetween the optical axis I and the optical boundary OB of the surface ofthe lens element.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1 , the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2 , optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis Ion the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2 . Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2 . Accordingly, sincethe extension line EL of the ray intersects the optical axis I on theobject side A1 of the lens element 200, periphery region Z2 is concave.In the lens element 200 illustrated in FIG. 2 , the first transitionpoint TP1 is the border of the optical axis region and the peripheryregion, i.e., TP1 is the point at which the shape changes from convex toconcave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius of curvature” (the “R”value), which is the paraxial radius of shape of a lens surface in theoptical axis region. The R value is commonly used in conventionaloptical design software such as Zemax and CodeV. The R value usuallyappears in the lens data sheet in the software. For an object-sidesurface, a positive R value defines that the optical axis region of theobject-side surface is convex, and a negative R value defines that theoptical axis region of the object-side surface is concave. Conversely,for an image-side surface, a positive R value defines that the opticalaxis region of the image-side surface is concave, and a negative R valuedefines that the optical axis region of the image-side surface isconvex. The result found by using this method should be consistent withthe method utilizing intersection of the optical axis by rays/extensionlines mentioned above, which determines surface shape by referring towhether the focal point of a collimated ray being parallel to theoptical axis I is on the object-side or the image-side of a lenselement. As used herein, the terms “a shape of a region is convex(concave),” “a region is convex (concave),” and “a convex-(concave-)region,” can be used alternatively.

FIG. 3 , FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3 , only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3 , since the shape of the optical axisregion Z1 is concave, the shape of the periphery region Z2 will beconvex as the shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4 , a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4 , theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region of 0%-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion of 50%-100% of the distance between the optical axis I and theoptical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5 , the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

As shown in FIG. 6 , the optical imaging lens 1 of nine lens elements ofthe present invention, sequentially located from an object side A1(where an object is located) to an image side A2 along an optical axisI, has a first lens element 10, a second lens element 20, a third lenselement 30, a fourth lens element 40, a fifth lens element 50, a sixthlens element 60, a seventh lens element 70, an eighth lens element 80, aninth lens element 90 and an image plane 4. Generally speaking, thefirst lens element 10, the second lens element 20, the third lenselement 30, the fourth lens element 40, the fifth lens element 50, thesixth lens element 60, the seventh lens element 70, the eighth lenselement 80 and the ninth lens element 90 may be made of a transparentplastic material but the present invention is not limited to this, andeach has appropriate refracting power. In the present invention, lenselements having refracting power included by the optical imaging lens 1are only the nine lens elements, for example the first lens element 10,the second lens element 20, the third lens element 30, the fourth lenselement 40, the fifth lens element 50, the sixth lens element 60, theseventh lens element 70, the eighth lens element 80 and the ninth lenselement 90 described above. The optical axis I is the optical axis ofthe entire optical imaging lens 1, and the optical axis of each of thelens elements coincides with the optical axis of the optical imaginglens 1.

Furthermore, the optical imaging lens 1 includes an aperture stop (ape.stop) 2 disposed in an appropriate position. In FIG. 6 , aperture stop 2is disposed at the object side A1 of the first lens element 10. In otherwords, the first lens element 10 is disposed between aperture stop 2 andthe second lens element 20. When ray emitted or reflected by an object(not shown) which is located at the object side A1 enters the opticalimaging lens 1 of the present invention, it forms a clear and sharpimage on the image plane 4 at the image side A2 after passing throughaperture stop 2, the first lens element 10, the second lens element 20,the third lens element 30, the fourth lens element 40, the fifth lenselement 50, the sixth lens element 60, the seventh lens element 70, theeighth lens element 80, the ninth lens element 90 and the filter 3. Ineach embodiment of the present invention, an filter 3 is placed betweenthe ninth lens element 90 and the image plane 4 to filter out ray of aspecific wavelength, for some embodiments, the optional filter 3 may bea filter of various suitable functions, for example, the filter 3 may bean infrared cut filter (IR cut filter) to keep infrared ray in theimaging rays from reaching the image plane 4 to jeopardize the imagingquality.

Each lens element in the optical imaging lens 1 of the present inventionhas an object-side surface facing toward the object side A1 as well asan image-side surface facing toward the image side A2. For example, thefirst lens element 10 has an object-side surface 11 and an image-sidesurface 12; the second lens element 20 has an object-side surface 21 andan image-side surface 22; the third lens element 30 has an object-sidesurface 31 and an image-side surface 32; the fourth lens element 40 hasan object-side surface 41 and an image-side surface 42; the fifth lenselement 50 has an object-side surface 51 and an image-side surface 52;the sixth lens element 60 has an object-side surface 61 and animage-side surface 62; the seventh lens element 70 has an object-sidesurface 71 and an image-side surface 72; the eighth lens element 80 hasan object-side surface 81 and an image-side surface 82, and the ninthlens element 90 has an object-side surface 91 and an image-side surface92. In addition, each object-side surface and image-side surface in theoptical imaging lens 1 of the present invention has an optical axisregion and a periphery region.

Each lens element in the optical imaging lens 1 of the present inventionfurther has a thickness T along the optical axis I. For example, thefirst lens element 10 has a first lens element thickness T1, the secondlens element 20 has a second lens element thickness T2, the third lenselement 30 has a third lens element thickness T3, the fourth lenselement 40 has a fourth lens element thickness T4, the fifth lenselement 50 has a fifth lens element thickness T5, the sixth lens element60 has a sixth lens element thickness T6, the seventh lens element 70has a seventh lens element thickness T7, the eighth lens element 80 hasan eighth lens element thickness T8, the ninth lens element 90 has aninth lens element thickness T9. Therefore, a sum of nine thicknesses ofthe nine lens elements from the first lens element 10 to the ninth lenselement 90 in the optical imaging lens 1 along the optical axis I isALT=T1+T2+T3+T4+T5+T6+T7+T8+T9.

In addition, between two adjacent lens elements in the optical imaginglens 1 of the present invention there may be an air gap along theoptical axis I. For example, there is an air gap G12 disposed betweenthe first lens element 10 and the second lens element 20, an air gap G23disposed between the second lens element 20 and the third lens element30, an air gap G34 disposed between the third lens element 30 and thefourth lens element 40, an air gap G45 disposed between the fourth lenselement 40 and the fifth lens element 50, an air gap G56 disposedbetween the fifth lens element 50 and the sixth lens element 60, an airgap G67 disposed between the sixth lens element 60 and the seventh lenselement 70, an air gap G78 disposed between the seventh lens element 70and the eighth lens element 80 as well as an air gap G89 disposedbetween the eighth lens element 80 and the ninth lens element 90.Therefore, a sum of eight air gaps from the first lens element 10 to theninth lens element 90 along the optical axis I isAAG=G12+G23+G34+G45+G56+G67+G78+G89.

AA15 is a sum of five air gaps from the first lens element 10 to thesixth lens element 60 along the optical axis I, namely the sum of G12,G23, G34, G45, G56; D12t62 is a distance from the image-side 12 surfaceof the first lens element 10 to the image-side surface 62 of the sixth60 lens element along the optical axis I, D62t92 is a distance from theimage-side surface 62 of the sixth lens element 60 to the image-sidesurface 92 of the ninth lens element 90 along the optical axis I, D62t82is a distance from the image-side surface 62 of the sixth lens element60 to the image-side surface 82 of the eighth lens element 80 along theoptical axis I, D12t32 is a distance from the image-side surface 12 ofthe first lens element 10 to the image-side surface 32 of the third lenselement 30 along the optical axis I, D51t62 is a distance from theobject-side surface 51 of the fifth lens element 50 to the image-sidesurface 62 of the sixth lens element 60 along the optical axis I, D32t51is a distance from the image-side surface 32 of the third lens element30 to the object-side surface 51 of the fifth lens element 50 along theoptical axis I, D41t62 is a distance from the object-side surface 41 ofthe fourth lens element 40 to the image-side surface 62 of the sixthlens element 60 along the optical axis I, and D11t32 is a distance fromthe object-side surface 11 of the first lens element 10 to theimage-side surface 32 of the third lens element 30 along the opticalaxis I.

In addition, a distance from the object-side surface 11 of the firstlens element 10 to the image plane 4 along the optical axis I is TTL,namely a system length of the optical imaging lens 1; an effective focallength of the optical imaging lens element is EFL; a distance from theobject-side surface 11 of the first lens element 10 to the image-sidesurface 92 of the ninth lens element 90 along the optical axis I is TL;HFOV stands for the half field of view which is half of the field ofview of the optical imaging lens 1; ImgH is an image height of theoptical imaging lens 1, Fno is an f-number of the optical imaging lens1, and EPD is an entrance pupil diameter of the optical imaging lens 1,which is EFL divided by Fno, namely EPD=EFL/Fno.

When the filter 3 is placed between the ninth lens element 90 and theimage plane 4, an air gap between the ninth lens element 90 and thefilter 3 along the optical axis I is G9F; a thickness of the filter 3along the optical axis I is TF; an air gap between the filter 3 and theimage plane 4 along the optical axis I is GFP; and a distance from theimage-side surface 92 of the ninth lens element 90 to the image plane 4along the optical axis I is BFL. Therefore, BFL=G9F+TF+GFP.

Furthermore, a focal length of the first lens element 10 is f1; a focallength of the second lens element 20 is f2; a focal length of the thirdlens element 30 is f3; a focal length of the fourth lens element 40 isf4; a focal length of the fifth lens element 50 is f5; a focal length ofthe sixth lens element 60 is f6; a focal length of the seventh lenselement 70 is f7; a focal length of the eighth lens element 80 is f8; afocal length of the ninth lens element 90 is f9; a refractive index ofthe first lens element 10 is n1; a refractive index of the second lenselement 20 is n2; a refractive index of the third lens element 30 is n3;a refractive index of the fourth lens element 40 is n4; a refractiveindex of the fifth lens element 50 is n5; a refractive index of thesixth lens element 60 is n6; a refractive index of the seventh lenselement 70 is n7; a refractive index of the eighth lens element 80 isn8; a refractive index of the ninth lens element 90 is n9; an Abbenumber of the first lens element 10 is ν1; an Abbe number of the secondlens element 20 is ν2; an Abbe number of the third lens element 30 isν3; and an Abbe number of the fourth lens element 40 is ν4; an Abbenumber of the fifth lens element 50 is ν5; an Abbe number of the sixthlens element 60 is ν6; an Abbe number of the seventh lens element 70 isν7; an Abbe number of the eighth lens element 80 is ν8 and an Abbenumber of the ninth lens element 90 is ν9.

First Embodiment

Please refer to FIG. 6 which illustrates the first embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG. 7Afor the longitudinal spherical aberration on the image plane 4 of thefirst embodiment; please refer to FIG. 7B for the field curvatureaberration on the sagittal direction; please refer to FIG. 7C for thefield curvature aberration on the tangential direction; and please referto FIG. 7D for the distortion aberration. The Y axis of the sphericalaberration in each embodiment is “field of view” for 1.0. The Y axis ofastigmatic field and the distortion in each embodiment stands for “imageheight” (ImgH), which is 6.940 mm.

The optical imaging lens 1 of the first embodiment has nine lenselements with refracting power, an aperture stop 2 and an image plane 4.Aperture stop 2 in the first embodiment is provided at a side of thefirst lens element 10 facing the object side A1.

The first lens element 10 has positive refracting power. An optical axisregion 13 of the object-side surface 11 of the first lens element 10 isconvex, and a periphery region 14 of the object-side surface 11 of thefirst lens element 10 is convex. An optical axis region 16 of theimage-side surface 12 of the first lens element 10 is concave, and aperiphery region 17 of the image-side surface 12 of the first lenselement 10 is concave. Besides, both the object-side surface 11 and theimage-side surface 12 of the first lens element 10 are asphericsurfaces, but it is not limited thereto.

The second lens element 20 has negative refracting power. An opticalaxis region 23 of the object-side surface 21 of the second lens element20 is convex, and a periphery region 24 of the object-side surface 21 ofthe second lens element 20 is convex. An optical axis region 26 of theimage-side surface 22 of the second lens element 20 is concave, and aperiphery region 27 of the image-side surface 22 of the second lenselement 20 is concave. Besides, both the object-side surface 21 and theimage-side surface 22 of the second lens element 20 are asphericsurfaces, but it is not limited thereto.

The third lens element 30 has negative refracting power. An optical axisregion 33 of the object-side surface 31 of the third lens element 30 isconvex, and a periphery region 34 of the object-side surface 31 of thethird lens element 30 is convex. An optical axis region 36 of theimage-side surface 32 of the third lens element 30 is concave, and aperiphery region 37 of the image-side surface 32 of the third lenselement 30 is concave. Besides, both the object-side surface 31 and theimage-side surface 32 of the third lens element 30 are asphericsurfaces, but it is not limited thereto.

The fourth lens element 40 has positive refracting power. An opticalaxis region 43 of the object-side surface 41 of the fourth lens element40 is convex, and a periphery region 44 of the object-side surface 41 ofthe fourth lens element 40 is concave. An optical axis region 46 of theimage-side surface 42 of the fourth lens element 40 is convex, and aperiphery region 47 of the image-side surface 42 of the fourth lenselement 40 is convex. Besides, both the object-side surface 41 and theimage-side surface 42 of the fourth lens element 40 are asphericsurfaces, but it is not limited thereto.

The fifth lens element 50 has negative refracting power. An optical axisregion 53 of the object-side surface 51 of the fifth lens element 50 isconcave, and a periphery region 54 of the object-side surface 51 of thefifth lens element 50 is concave. An optical axis region 56 of theimage-side surface 52 of the fifth lens element 50 is convex, and aperiphery region 57 of the image-side surface 52 of the fifth lenselement 50 is convex. Besides, both the object-side surface 51 and theimage-side surface 52 of the fifth lens element 50 are asphericsurfaces, but it is not limited thereto.

The sixth lens element 60 has negative refracting power. An optical axisregion 63 of the object-side surface 61 of the sixth lens element 60 isconvex, and a periphery region 64 of the object-side surface 61 of thesixth lens element 60 is convex. An optical axis region 66 of theimage-side surface 62 of the sixth lens element 60 is concave, and aperiphery region 67 of the image-side surface 62 of the sixth lenselement 60 is convex. Besides, both the object-side surface 61 and theimage-side surface 62 of the sixth lens element 60 are asphericsurfaces, but it is not limited thereto.

The seventh lens element 70 has negative refracting power. An opticalaxis region 73 of the object-side surface 71 of the seventh lens element70 is concave, and a periphery region 74 of the object-side surface 71of the seventh lens element 70 is concave. An optical axis region 76 ofthe image-side surface 72 of the seventh lens element 70 is convex, anda periphery region 77 of the image-side surface 72 of the seventh lenselement 70 is convex. Besides, both the object-side surface 71 and theimage-side surface 72 of the seventh lens element 70 are asphericsurfaces, but it is not limited thereto.

The eighth lens element 80 has negative refracting power. An opticalaxis region 83 of the object-side surface 81 of the eighth lens element80 is convex, and a periphery region 84 of the object-side surface 81 ofthe eighth lens element 80 is concave. An optical axis region 86 of theimage-side surface 82 of the eighth lens element 80 is concave, and aperiphery region 87 of the image-side surface 82 of the eighth lenselement 80 is convex. Besides, both the object-side surface 81 and theimage-side surface 82 of the eighth lens element 80 are asphericsurfaces, but it is not limited thereto.

The ninth lens element 90 has negative refracting power. An optical axisregion 93 of the object-side surface 91 of the ninth lens element 90 isconcave, and a periphery region 94 of the object-side surface 91 of theninth lens element 90 is concave. An optical axis region 96 of theimage-side surface 92 of the ninth lens element 90 is concave, and aperiphery region 97 of the image-side surface 92 of the ninth lenselement 90 is convex. Besides, both the object-side surface 91 and theimage-side surface 92 of the ninth lens element 90 are asphericsurfaces, but it is not limited thereto.

In the first lens element 10, the second lens element 20, the third lenselement 30, the fourth lens element 40, the fifth lens element 50, thesixth lens element 60, the seventh lens element 70, the eighth lenselement 80 and the ninth lens element 90 of the optical imaging lenselement 1 of the present invention, there are 18 surfaces, such as theobject-side surfaces 11/21/31/41/51/61/71/81/91 and the image-sidesurfaces 12/22/32/42/52/62/72/82/92. If a surface is aspheric, theseaspheric coefficients are defined according to the following formula:

${Z(Y)} = {\frac{Y^{2}}{R}/\left( {1 + \sqrt{\left. {1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{i} \times Y^{i}}}} \right.}$

In which:

Y represents a vertical distance from a point on aspheric surface to theoptical axis;Z represents a depth of an aspheric surface (the perpendicular distancebetween the point of aspheric surface at a distance Y from the opticalaxis and the tangent plane of the vertex on the optical axis of asphericsurface);R represents the radius of curvature of the lens element surface;K is a conic constant; anda₁ is an aspheric coefficient of the i^(th) order, and a₂ coefficient ineach embodiment is 0.

The optical data of the first embodiment of the optical imaging lens 1are shown in FIG. 24 while aspheric surface data are shown in FIG. 25 .In the present embodiments of the optical imaging lens, the f-number ofthe entire optical imaging lens element system is Fno, EFL is theeffective focal length, HFOV stands for the half field of view which ishalf of the field of view of the entire optical imaging lens elementsystem, and the unit for the radius of curvature, the thickness and thefocal length is in millimeters (mm). In this embodiment, EFL=6.883 mm;HFOV=42.147 degrees; TTL=8.745 mm; Fno=1.610; ImgH=6.940 mm.

Second Embodiment

Please refer to FIG. 8 which illustrates the second embodiment of theoptical imaging lens 1 of the present invention. It is noted that fromthe second embodiment to the following embodiments, in order to simplifythe figures, only the components different from what the firstembodiment has, and the basic lens elements will be labeled in figures.Other components that are the same as what the first embodiment has,such as the object-side surface, the image-side surface, the portion ina vicinity of the optical axis and the portion in a vicinity of itsperiphery will be omitted in the following embodiments. Please refer toFIG. 9A for the longitudinal spherical aberration on the image plane 4of the second embodiment, please refer to FIG. 9B for the fieldcurvature aberration on the sagittal direction, please refer to FIG. 9Cfor the field curvature aberration on the tangential direction, andplease refer to FIG. 9D for the distortion aberration. The components inthis embodiment are similar to those in the first embodiment, but theoptical data such as the radius of curvature, the thickness of the lenselement, aspheric surface or the back focal length in this embodimentare different from the optical data in the first embodiment. Besides, inthis embodiment, an optical axis region 43 of the object-side surface 41of the fourth lens element 40 is concave, a periphery region 64 of theobject-side surface 61 of the sixth lens element 60 is concave, theseventh lens element 70 has positive refracting power, the eighth lenselement 80 has positive refracting power, and a periphery region 94 ofthe object-side surface 91 of the ninth lens element 90 is convex.

The optical data of the second embodiment of the optical imaging lensare shown in FIG. 26 while aspheric surface data are shown in FIG. 27 .In this embodiment, EFL=7.036 mm; HFOV=43.016 degrees; TTL=8.809 mm;Fno=1.610; ImgH=6.977 mm. In particular: 1. the HFOV in this embodimentis larger than the HFOV in the first embodiment; 2. the longitudinalspherical aberration in this embodiment is better than the longitudinalspherical aberration in the first embodiment; 3. the field curvatureaberration on the sagittal direction in this embodiment is better thanthe field curvature aberration on the sagittal direction in the firstembodiment.

Third Embodiment

Please refer to FIG. 10 which illustrates the third embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.11A for the longitudinal spherical aberration on the image plane 4 ofthe third embodiment; please refer to FIG. 11B for the field curvatureaberration on the sagittal direction; please refer to FIG. 11C for thefield curvature aberration on the tangential direction; and please referto FIG. 11D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the radius of curvature, the thickness of the lens element,aspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, the second lens element 20 has positive refractingpower, the third lens element 30 has positive refracting power, anoptical axis region 43 of the object-side surface 41 of the fourth lenselement 40 is concave, an optical axis region 56 of the image-sidesurface 52 of the fifth lens element 50 is concave, the sixth lenselement 60 has positive refracting power, a periphery region 64 of theobject-side surface 61 of the sixth lens element 60 is concave, aperiphery region 67 of the image-side surface 62 of the sixth lenselement 60 is concave, and the seventh lens element 70 has positiverefracting power.

The optical data of the third embodiment of the optical imaging lens areshown in FIG. 28 while aspheric surface data are shown in FIG. 29 . Inthis embodiment, EFL=6.071 mm; HFOV=42.147 degrees; TTL=8.220 mm;Fno=1.610; ImgH=6.755 mm. In particular: 1. the system length of theoptical imaging lens TTL in this embodiment is shorter than the systemlength of the optical imaging lens TTL in the first embodiment; 2. thelongitudinal spherical aberration in this embodiment is better than thelongitudinal spherical aberration in the first embodiment; 3. the fieldcurvature aberration on the sagittal direction in this embodiment isbetter than the field curvature aberration on the sagittal direction inthe first embodiment.

Fourth Embodiment

Please refer to FIG. 12 which illustrates the fourth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.13A for the longitudinal spherical aberration on the image plane 4 ofthe fourth embodiment; please refer to FIG. 13B for the field curvatureaberration on the sagittal direction; please refer to FIG. 13C for thefield curvature aberration on the tangential direction; and please referto FIG. 13D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the radius of curvature, the thickness of the lens element,aspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, the fourth lens element 40 has negative refractingpower, an optical axis region 43 of the object-side surface 41 of thefourth lens element 40 is concave, the fifth lens element 50 haspositive refracting power, an optical axis region 53 of the object-sidesurface 51 of the fifth lens element 50 is convex, the sixth lenselement 60 has positive refracting power, a periphery region 67 of theimage-side surface 62 of the sixth lens element 60 is concave, theseventh lens element 70 has positive refracting power, and a peripheryregion 94 of the object-side surface 91 of the ninth lens element 90 isconvex.

The optical data of the fourth embodiment of the optical imaging lensare shown in FIG. 30 while aspheric surface data are shown in FIG. 31 .In this embodiment, EFL=7.003 mm; HFOV=42.155 degrees; TTL=8.899 mm;Fno=1.610; ImgH=6.667 mm. In particular: 1. the HFOV in this embodimentis larger than the HFOV in the first embodiment; 2. the longitudinalspherical aberration in this embodiment is better than the longitudinalspherical aberration in the first embodiment; 3. the field curvatureaberration on the sagittal direction in this embodiment is better thanthe field curvature aberration on the sagittal direction in the firstembodiment; 4. the field curvature aberration on the tangentialdirection in this embodiment is better than the field curvatureaberration on the tangential direction in the first embodiment.

Fifth Embodiment

Please refer to FIG. 14 which illustrates the fifth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.15A for the longitudinal spherical aberration on the image plane 4 ofthe fifth embodiment; please refer to FIG. 15B for the field curvatureaberration on the sagittal direction; please refer to FIG. 15C for thefield curvature aberration on the tangential direction, and please referto FIG. 15D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the radius of curvature, the thickness of the lens element,aspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, an optical axis region 43 of the object-side surface 41of the fourth lens element 40 is concave, an optical axis region 56 ofthe image-side surface 52 of the fifth lens element 50 is concave, thesixth lens element 60 has positive refracting power, the seventh lenselement 70 has positive refracting power, and the eighth lens element 80has positive refracting power.

The optical data of the fifth embodiment of the optical imaging lens areshown in FIG. 32 while aspheric surface data are shown in FIG. 33 . Inthis embodiment, EFL=6.490 mm; HFOV=41.940 degrees; TTL=8.718 mm;Fno=1.610; ImgH=6.500 mm. In particular: 1. the system length of theoptical imaging lens TTL in this embodiment is shorter than the systemlength of the optical imaging lens TTL in the first embodiment; 2. thelongitudinal spherical aberration in this embodiment is better than thelongitudinal spherical aberration in the first embodiment; 3. the fieldcurvature aberration on the sagittal direction in this embodiment isbetter than the field curvature aberration on the sagittal direction inthe first embodiment; 4. the field curvature aberration on thetangential direction in this embodiment is better than the fieldcurvature aberration on the tangential direction in the firstembodiment.

Sixth Embodiment

Please refer to FIG. 16 which illustrates the sixth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.17A for the longitudinal spherical aberration on the image plane 4 ofthe sixth embodiment; please refer to FIG. 17B for the field curvatureaberration on the sagittal direction; please refer to FIG. 17C for thefield curvature aberration on the tangential direction, and please referto FIG. 17D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the radius of curvature, the thickness of the lens element,aspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, an optical axis region 43 of the object-side surface 41of the fourth lens element 40 is concave, an optical axis region 53 ofthe object-side surface 51 of the fifth lens element 50 is convex, anoptical axis region 56 of the image-side surface 52 of the fifth lenselement 50 is concave, the sixth lens element 60 has positive refractingpower, a periphery region 67 of the image-side surface 62 of the sixthlens element 60 is concave, the seventh lens element 70 has positiverefracting power, the ninth lens element 90 has positive refractingpower, and an optical axis region 93 of the object-side surface 91 ofthe ninth lens element 90 is convex.

The optical data of the sixth embodiment of the optical imaging lens areshown in FIG. 34 while aspheric surface data are shown in FIG. 35 . Inthis embodiment, EFL=5.918 mm; HFOV=41.907 degrees; TTL=8.549 mm;Fno=1.610; ImgH=6.500 mm. In particular: 1. the system length of theoptical imaging lens TTL in this embodiment is shorter than the systemlength of the optical imaging lens TTL in the first embodiment; 2. thelongitudinal spherical aberration in this embodiment is better than thelongitudinal spherical aberration in the first embodiment; 3. the fieldcurvature aberration on the sagittal direction in this embodiment isbetter than the field curvature aberration on the sagittal direction inthe first embodiment.

Seventh Embodiment

Please refer to FIG. 18 which illustrates the seventh embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.19A for the longitudinal spherical aberration on the image plane 4 ofthe seventh embodiment; please refer to FIG. 19B for the field curvatureaberration on the sagittal direction; please refer to FIG. 19C for thefield curvature aberration on the tangential direction, and please referto FIG. 19D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the radius of curvature, the thickness of the lens element,aspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, the first lens element 10 has negative refractingpower, the second lens element 20 has positive refracting power, anoptical axis region 56 of the image-side surface 52 of the fifth lenselement 50 is concave, the sixth lens element 60 has positive refractingpower, the seventh lens element 70 has positive refracting power, aperiphery region 77 of the image-side surface 72 of the seventh lenselement 70 is concave, and the eighth lens element 80 has positiverefracting power.

The optical data of the seventh embodiment of the optical imaging lensare shown in FIG. 36 while aspheric surface data are shown in FIG. 37 .In this embodiment, EFL=5.837 mm; HFOV=42.240 degrees; TTL=9.015 mm;Fno=1.610; ImgH=6.500 mm. In particular: 1. the HFOV in this embodimentis larger than the HFOV in the first embodiment; 2. the longitudinalspherical aberration in this embodiment is better than the longitudinalspherical aberration in the first embodiment; 3. the field curvatureaberration on the sagittal direction in this embodiment is better thanthe field curvature aberration on the sagittal direction in the firstembodiment.

Eighth Embodiment

Please refer to FIG. 20 which illustrates the eighth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.21A for the longitudinal spherical aberration on the image plane 4 ofthe eighth embodiment; please refer to FIG. 21B for the field curvatureaberration on the sagittal direction; please refer to FIG. 21C for thefield curvature aberration on the tangential direction, and please referto FIG. 21D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the radius of curvature, the thickness of the lens element,aspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, an optical axis region 56 of the image-side surface 52of the fifth lens element 50 is concave, the sixth lens element 60 haspositive refracting power, a periphery region 67 of the image-sidesurface 62 of the sixth lens element 60 is concave, the seventh lenselement 70 has positive refracting power, the ninth lens element 90 haspositive refracting power, and an optical axis region 96 of theimage-side surface 92 of the ninth lens element 90 is convex.

The optical data of the eighth embodiment of the optical imaging lensare shown in FIG. 38 while aspheric surface data are shown in FIG. 39 .In this embodiment, EFL=6.531 mm; HFOV=42.147 degrees; TTL=8.855 mm;Fno=1.610; ImgH=6.732 mm. In particular: 1. the longitudinal sphericalaberration in this embodiment is better than the longitudinal sphericalaberration in the first embodiment; 2. the field curvature aberration onthe sagittal direction in this embodiment is better than the fieldcurvature aberration on the sagittal direction in the first embodiment.

Ninth Embodiment

Please refer to FIG. 22 which illustrates the ninth embodiment of theoptical imaging lens 1 of the present invention. Please refer to FIG.23A for the longitudinal spherical aberration on the image plane 4 ofthe ninth embodiment; please refer to FIG. 23B for the field curvatureaberration on the sagittal direction; please refer to FIG. 23C for thefield curvature aberration on the tangential direction, and please referto FIG. 23D for the distortion aberration. The components in thisembodiment are similar to those in the first embodiment, but the opticaldata such as the radius of curvature, the thickness of the lens element,aspheric surface or the back focal length in this embodiment aredifferent from the optical data in the first embodiment. Besides, inthis embodiment, an optical axis region 56 of the image-side surface 52of the fifth lens element 50 is concave, the sixth lens element 60 haspositive refracting power, a periphery region 67 of the image-sidesurface 62 of the sixth lens element 60 is concave, the seventh lenselement 70 has positive refracting power, and a periphery region 94 ofthe object-side surface 91 of the ninth lens element 90 is convex.

The optical data of the ninth embodiment of the optical imaging lens areshown in FIG. 40 while aspheric surface data are shown in FIG. 41 . Inthis embodiment, EFL=6.098 mm; HFOV=44.136 degrees; TTL=8.288 mm;Fno=1.390; ImgH=6.901 mm. In particular: 1. the system length of theoptical imaging lens TTL in this embodiment is shorter than the systemlength of the optical imaging lens TTL in the first embodiment; 2. theFno in this embodiment is smaller than the Fno in the first embodiment;3. the HFOV in this embodiment is larger than the HFOV in the firstembodiment; 4. the longitudinal spherical aberration in this embodimentis better than the longitudinal spherical aberration in the firstembodiment; 5. the field curvature aberration on the sagittal directionin this embodiment is better than the field curvature aberration on thesagittal direction in the first embodiment; 6. the field curvatureaberration on the tangential direction in this embodiment is better thanthe field curvature aberration on the tangential direction in the firstembodiment.

Some important ratios in each embodiment are shown in FIG. 42 and inFIG. 43 .

Each embodiment of the present invention provides an optical imaginglens 1 with smaller Fno, larger image height and improved resolutionwhile it is beneficial to maintain the system length, to maintain goodimaging quality and to be technically plausible:

1. When the optical imaging lens element of the present inventionsatisfies that a periphery region 44 of the object-side surface 41 ofthe fourth lens element 40 is concave, an optical axis region 46 of theimage-side surface 42 of the fourth lens element 40 is convex, and anoptical axis region 73 of the object-side surface 71 of the seventh lenselement 70 is concave, it is conducive to design a lens of a largeraperture stop and of a larger image height. The optical imaging lenselement may be further limited to that an optical axis region 86 of theimage-side surface 82 of the eighth lens element 80 is concave, anoptical axis region 93 of the object-side surface 91 of the ninth lenselement 90 is concave and ν5+ν9≤100.000, it is conducive to reduce thesystem length TTL, and to let the ray transfer in the outer field ofview (0.6˜1.0 field of view) become smooth to reduce the sensitivity andto enhance manufacturability. The more preferable range is38.000≤ν5+ν9≤100.000.2. When the optical imaging lens element of the present inventionsatisfies that a periphery region 34 of the object-side surface 31 ofthe third lens element 30 is convex, a periphery region 44 of theobject-side surface 41 of the fourth lens element 40 is concave and anoptical axis region 73 of the object-side surface 71 of the seventh lenselement 70 is concave, it is conducive to design a lens of a largeraperture stop and of a larger image height. The optical imaging lenselement may be further limited to that the first lens element 10 haspositive refracting power, the second lens element 20 has negativerefracting power, an optical axis region 96 of the image-side surface 92of the ninth lens element 90 is concave and ν8+ν9≤100.000, it isconducive to reduce the system length TTL, and to let the ray transferin the outer field of view (0.6˜1.0 field of view) become smooth toreduce the sensitivity and to enhance manufacturability. The morepreferable range is 38.000≤ν8+ν9≤100.000.3. When the optical imaging lens element of the present inventionsatisfies that a periphery region 37 of the image-side surface 32 of thethird lens element 30 is concave, a periphery region 54 of theobject-side surface 51 of the fifth lens element 50 is concave and anoptical axis region 73 of the object-side surface 71 of the seventh lenselement 70 is concave, it is conducive to design a lens of a largeraperture stop and of a larger image height. The optical imaging lenselement may be further limited to that an optical axis region 63 of theobject-side surface 61 of the sixth lens element 60 is convex, anoptical axis region 96 of the image-side surface 92 of the ninth lenselement 90 is concave, a periphery region 97 of the image-side surface92 of the ninth lens element 90 is convex and ν8+ν9≤100.000, it isconducive to reduce the system length TTL, and to let the ray transferin the outer field of view (0.6˜1.0 field of view) become smooth toreduce the sensitivity and to enhance manufacturability. The morepreferable range is 38.000≤ν8+ν9≤100.000.4. When the optical imaging lens element of the present inventionsatisfies ν5+ν6≤100.000, ν3+ν9≤100.000 or ν7+ν8+ν9≤135.000, it isconducive to enhance the modulation transfer function (MTF) of theoptical imaging lens element to increase the resolution. The preferableranges are 38.000≤ν5+ν6≤100.000, 38.000≤ν3+ν9≤100.000 or57.000≤ν7+ν8+ν9≤135.000, and the more preferable ranges are74.000≤ν5+ν6≤100.000, 38.000≤ν3+ν9≤80.000 or 93.000≤ν7+ν8+ν9≤135.000.5. If the following conditional formulae of the optical imaging lens 1of the present invention are optionally satisfied, it may keep thethicknesses and gaps of each lens element in suitable ranges and fromthat the parameters are too great to shrink the optical imaging lens, ortoo small to assemble, or the difficulty of the fabrication may beincreased while it helps provide a larger aperture stop and a largeimage height:1) Fno*AA15/T2≤6.000, and the preferable range is1.500≤Fno*AA15/T2≤6.000;2) 4.000≤(EPD+TTL)/D12t62, and the preferable range is4.000≤(EPD+TTL)/D12t62≤6.300;3) 3.200≤(T1+D62t92)/(AA15+T6), and the preferable range is3.200≤(T1+D62t92)/(AA15+T6)≤6.500;4)(AAG+BFL)/D62t82≤3.900, and the preferable range is2.000≤(AAG+BFL)/D62t82≤3.900;5) 26.000 degrees≤HFOV/Fno, and the preferable range is 26.000degrees≤HFOV/Fno≤32.000 degrees;6) (D12t32+D51t62)/D32t51≤2.100, and the preferable range is1.000≤(D12t32+D51t62)/D32t51≤2.100;7) D41t62/(T3+G34)≤3.400, and the preferable range is1.600≤D41t62/(T3+G34)≤3.400;8) Fno*D11t32/T7≤4.300, and the preferable range is2.400≤Fno*D11t32/T7≤4.300;9) D11t32/G67≤3.400, and the preferable range is 1.200≤D11t32/G67≤3.400;10) 5.000≤(ALT+EPD)/D11t32, and the preferable range is5.000≤(ALT+EPD)/D11t32≤7.300;11) Fno*D11t62/(T7+T8+T9)≤3.600, and the preferable range is1.900≤Fno*D11t62/(T7+T8+T9)≤3.600;12) D41t62/G67≤3.600, and the preferable range is1.600≤D41t62/G67≤3.600;13) (D12t32+D51t62)/T8≤3.500, and the preferable range is1.200≤(D12t32+D51t62)/T8≤3.500;14) (AA15+T6)/G67≤2.500, and the preferable range is0.900≤(AA15+T6)/G67≤2.500;15) 13.000 degrees/mm≤HFOV/D12t62, and the preferable range is 13.000degrees/mm≤HFOV/D12t62≤20.000 degrees/mm;16) 5.700≤(EPD+TL)/(D12t32+D51t62), and the preferable range is5.700≤(EPD+TL)/(D12t32+D51t62)≤11.000;17) 2.700≤(ImgH+EPD)/(D12t32+D41t62), and the preferable range is2.700≤(ImgH+EPD)/(D12t32+D41t62)≤6.000;18) 2.300≤(EFL+EPD)/(D12t32+D41t62), and the preferable range is2.300≤(EFL+EPD)/(D12t32+D41t62)≤6.000.

In addition, any arbitrary combination of the parameters of theembodiments can be selected to increase the lens limitation so as tofacilitate the design of the same structure of the present invention.

In the light of the unpredictability of the optical imaging lens, thepresent invention suggests above principles to have a reduced systemlength of the optical imaging lens, a larger aperture stop available,enhanced imaging quality or a better fabrication yield to overcome thedrawbacks of prior art.

In addition to the above ratios, one or more conditional formulae may beoptionally combined to be used in the embodiments of the presentinvention and the present invention is not limit to this. The concave orconvex configuration of each lens element or multiple lens elements maybe fine-tuned to enhance the performance and/or the resolution. Theabove limitations may be selectively combined in the embodiments withoutcausing inconsistency.

The contents in the embodiments of the invention include but are notlimited to a focal length, a thickness of a lens element, an Abbenumber, or other optical parameters. For example, in the embodiments ofthe invention, an optical parameter A and an optical parameter B aredisclosed, wherein the ranges of the optical parameters, comparativerelation between the optical parameters, and the range of a conditionalexpression covered by a plurality of embodiments are specificallyexplained as follows:

(1) The ranges of the optical parameters are, for example, α₂≤A≤α₁ orβ₂≤B≤β₁, where α₁ is a maximum value of the optical parameter A amongthe plurality of embodiments, α₂ is a minimum value of the opticalparameter A among the plurality of embodiments, β₁ is a maximum value ofthe optical parameter B among the plurality of embodiments, and β₂ is aminimum value of the optical parameter B among the plurality ofembodiments.(2) The comparative relation between the optical parameters is that A isgreater than B or A is less than B, for example.(3) The range of a conditional expression covered by a plurality ofembodiments is in detail a combination relation or proportional relationobtained by a possible operation of a plurality of optical parameters ineach same embodiment. The relation is defined as E, and E is, forexample, A+B or A−B or A/B or A*B or (A*B)^(1/2), and E satisfies aconditional expression E≤γ₁ or E≥γ₂ or γ₂≤E≤γ₁, where each of γ₁ and γ₂is a value obtained by an operation of the optical parameter A and theoptical parameter B in a same embodiment, γ₁ is a maximum value amongthe plurality of the embodiments, and γ₂ is a minimum value among theplurality of the embodiments.

The ranges of the aforementioned optical parameters, the aforementionedcomparative relations between the optical parameters, and a maximumvalue, a minimum value, and the numerical range between the maximumvalue and the minimum value of the aforementioned conditionalexpressions are all implementable and all belong to the scope disclosedby the invention. The aforementioned description is for exemplaryexplanation, but the invention is not limited thereto.

The embodiments of the invention are all implementable. In addition, acombination of partial features in a same embodiment can be selected,and the combination of partial features can achieve the unexpectedresult of the invention with respect to the prior art. The combinationof partial features includes but is not limited to the surface shape ofa lens element, a refracting power, a conditional expression or thelike, or a combination thereof. The description of the embodiments isfor explaining the specific embodiments of the principles of theinvention, but the invention is not limited thereto. Specifically, theembodiments and the drawings are for exemplifying, but the invention isnot limited thereto.

Those skilled in art will readily observe that numerous modificationsand alterations of the device and method may be made while retaining theteachings of the invention. Accordingly, above disclosure should beconstrued as limited only by the metes and bounds of appended claims.

What is claimed is:
 1. An optical imaging lens, from an object side toan image side in order along an optical axis comprising: a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement, an eighth lens element and a ninth lens element, the first lenselement to the ninth lens element each having an object-side surfacefacing toward the object side and allowing imaging rays to pass throughas well as an image-side surface facing toward the image side andallowing the imaging rays to pass through, wherein: a periphery regionof the object-side surface of the fourth lens element is concave; anoptical axis region of the image-side surface of the fourth lens elementis convex; an optical axis region of the object-side surface of theseventh lens element is concave; an optical axis region of theimage-side surface of the eighth lens element is concave; and an opticalaxis region of the object-side surface of the ninth lens element isconcave; wherein lens elements included by the optical imaging lens areonly the nine lens elements described above, an Abbe number of the fifthlens element is ν5 and an Abbe number of the ninth lens element is ν9 tosatisfy ν5+ν9≤100.000.
 2. The optical imaging lens of claim 1, whereinν6 is an Abbe number of the sixth lens element, and the optical imaginglens satisfies the relationship: ν5+ν9≤100.000.
 3. The optical imaginglens of claim 1, wherein Fno is an f-number of the optical imaging lens,AA15 is a sum of five air gaps from the first lens element to the sixthlens element along the optical axis, T2 is a thickness of the secondlens element along the optical axis, and the optical imaging lenssatisfies the relationship: Fno*AA15/T2≤6.000.
 4. The optical imaginglens of claim 1, wherein EPD is an entrance pupil diameter of theoptical imaging lens, TTL is the distance from the object-side surfaceof the first lens element to an image plane along the optical axis,D12t62 is defined as a distance from the image-side surface of the firstlens element to the image-side surface of the sixth lens element alongthe optical axis, and the optical imaging lens satisfies therelationship: 4.000≤(EPD+TTL)/D12t62.
 5. The optical imaging lens ofclaim 1, wherein T1 is a thickness of the first lens element along theoptical axis, T6 is a thickness of the sixth lens element along theoptical axis, AA15 is a sum of five air gaps from the first lens elementto the sixth lens element along the optical axis, D62t92 is defined as adistance from the image-side surface of the sixth lens element to theimage-side surface of the ninth lens element along the optical axis, andthe optical imaging lens satisfies the relationship:3.200≤(T1+D62t92)/(AA15+T6).
 6. The optical imaging lens of claim 1,wherein AAG is a sum of eight air gaps from the first lens element tothe ninth lens element along the optical axis, BFL is a distance fromthe image-side surface of the ninth lens element to an image plane alongthe optical axis, D62t82 is defined as a distance from the image-sidesurface of the sixth lens element to the image-side surface of theeighth lens element along the optical axis, and the optical imaging lenssatisfies the relationship: (AAG+BFL)/D62t82≤3.900.
 7. The opticalimaging lens of claim 1, wherein HFOV stands for the half field of viewof the optical imaging lens, Fno is an f-number of the optical imaginglens, and the optical imaging lens satisfies the relationship: 26.000degrees≤HFOV/Fno.
 8. An optical imaging lens, from an object side to animage side in order along an optical axis comprising: a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement, an eighth lens element and a ninth lens element, the first lenselement to the ninth lens element each having an object-side surfacefacing toward the object side and allowing imaging rays to pass throughas well as an image-side surface facing toward the image side andallowing the imaging rays to pass through, wherein: the first lenselement has positive refracting power; the second lens element hasnegative refracting power; a periphery region of the object-side surfaceof the third lens element is convex; a periphery region of theobject-side surface of the fourth lens element is concave; an opticalaxis region of the object-side surface of the seventh lens element isconcave; and an optical axis region of the image-side surface of theninth lens element is concave; wherein lens elements included by theoptical imaging lens are only the nine lens elements described above, anAbbe number of the eighth lens element is ν8 and an Abbe number of theninth lens element is ν9 to satisfy ν8+ν9≤100.000.
 9. The opticalimaging lens of claim 8, wherein D12t32 is defined as a distance fromthe image-side surface of the first lens element to the image-sidesurface of the third lens element along the optical axis, D51t62 isdefined as a distance from the object-side surface of the fifth lenselement to the image-side surface of the sixth lens element along theoptical axis, D32t51 is defined as a distance from the image-sidesurface of the third lens element to the object-side surface of thefifth lens element along the optical axis, and the optical imaging lenssatisfies the relationship: (D12t32+D51t62)/D32t51≤2.100.
 10. Theoptical imaging lens of claim 8, wherein D41t62 is defined as a distancefrom the object-side surface of the fourth lens element to theimage-side surface of the sixth lens element along the optical axis, T3is a thickness of the third lens element along the optical axis, G34 isan air gap between the third lens element and the fourth lens elementalong the optical axis, and the optical imaging lens satisfies therelationship: D41t62/(T3+G34)≤3.400.
 11. The optical imaging lens ofclaim 8, wherein Fno is an f-number of the optical imaging lens, D11t32is defined as a distance from the object-side surface of the first lenselement to the image-side surface of the third lens element along theoptical axis, T7 is a thickness of the seventh lens element along theoptical axis, and the optical imaging lens satisfies the relationship:Fno*D11t32/T7≤4.300.
 12. The optical imaging lens of claim 8, whereinD11t32 is defined as a distance from the object-side surface of thefirst lens element to the image-side surface of the third lens elementalong the optical axis, G67 is an air gap between the sixth lens elementand the seventh lens element along the optical axis, and the opticalimaging lens satisfies the relationship: D11t32/G67≤3.400.
 13. Theoptical imaging lens of claim 8, wherein ALT is a sum of ninethicknesses of the nine lens elements from the first lens element to theninth lens element along the optical axis, EPD is an entrance pupildiameter of the optical imaging lens, D11t32 is defined as a distancefrom the object-side surface of the first lens element to the image-sidesurface of the third lens element along the optical axis, and theoptical imaging lens satisfies the relationship: 5.000≤(ALT+EPD)/D11t32.14. The optical imaging lens of claim 8, wherein Fno is an f-number ofthe optical imaging lens, D11t62 is defined as a distance from theobject-side surface of the first lens element to the image-side surfaceof the sixth lens element along the optical axis, T7 is a thickness ofthe seventh lens element along the optical axis, T8 is a thickness ofthe eighth lens element along the optical axis, T9 is a thickness of theninth lens element along the optical axis, and the optical imaging lenssatisfies the relationship: Fno*D11t62/(T7+T8+T9)≤3.600.
 15. An opticalimaging lens, from an object side to an image side in order along anoptical axis comprising: a first lens element, a second lens element, athird lens element, a fourth lens element, a fifth lens element, a sixthlens element, a seventh lens element, an eighth lens element and a ninthlens element, the first lens element to the ninth lens element eachhaving an object-side surface facing toward the object side and allowingimaging rays to pass through as well as an image-side surface facingtoward the image side and allowing the imaging rays to pass through,wherein: a periphery region of the image-side surface of the third lenselement is concave; a periphery region of the object-side surface of thefifth lens element is concave; an optical axis region of the object-sidesurface of the sixth lens element is convex; an optical axis region ofthe object-side surface of the seventh lens element is concave; and anoptical axis region of the image-side surface of the ninth lens elementis concave and a periphery region of the image-side surface of the ninthlens element is convex; wherein lens elements included by the opticalimaging lens are only the nine lens elements described above, an Abbenumber of the eighth lens element is ν8 and an Abbe number of the ninthlens element is ν9 to satisfy ν8+ν9≤100.000.
 16. The optical imaginglens of claim 15, wherein D41t62 is defined as a distance from theobject-side surface of the fourth lens element to the image-side surfaceof the sixth lens element along the optical axis, G67 is an air gapbetween the sixth lens element and the seventh lens element along theoptical axis, and the optical imaging lens satisfies the relationship:D41t62/G67≤3.600.
 17. The optical imaging lens of claim 15, whereinD12t32 is defined as a distance from the image-side surface of the firstlens element to the image-side surface of the third lens element alongthe optical axis, D51t62 is defined as a distance from the object-sidesurface of the fifth lens element to the image-side surface of the sixthlens element along the optical axis, T8 is a thickness of the eighthlens element along the optical axis, and the optical imaging lenssatisfies the relationship: (D12t32+D51t62)/T8≤3.500.
 18. The opticalimaging lens of claim 15, wherein AA15 is a sum of five air gaps fromthe first lens element to the sixth lens element along the optical axis,T6 is a thickness of the sixth lens element along the optical axis, G67is an air gap between the sixth lens element and the seventh lenselement along the optical axis, and the optical imaging lens satisfiesthe relationship: (AA15+T6)/G67≤2.500.
 19. The optical imaging lens ofclaim 15, wherein HFOV stands for the half field of view of the opticalimaging lens, D12t62 is defined as a distance from the image-sidesurface of the first lens element to the image-side surface of the sixthlens element along the optical axis, and the optical imaging lenssatisfies the relationship: 13.000 degrees/mm≤HFOV/D12t62.
 20. Theoptical imaging lens of claim 15, wherein EPD is an entrance pupildiameter of the optical imaging lens, TL is a distance from theobject-side surface of the first lens element to the image-side surfaceof the ninth lens element along the optical axis, D12t32 is defined as adistance from the image-side surface of the first lens element to theimage-side surface of the third lens element along the optical axis,D51t62 is defined as a distance from the object-side surface of thefifth lens element to the image-side surface of the sixth lens elementalong the optical axis, and the optical imaging lens satisfies therelationship: 5.700≤(EPD+TL)/(D12t32+D51t62).